Mechanism for slotting piston-ring castings



'Dece 6, C. N. TEETOR I MECHANISM FR SLOTTING FIST-ON RING CASTINGS "H, il ,7496.

.25 I zap harias 75.126955# Dec. s, 1927.

1,651,980 C. N. TEETOR MECHANISM 'OR SLOTTING PISTON RING CASTINGS Fled'OOt. 25, 1926 2 Sheets-Sheet 2 l Patented Dec. y 6, 1927.

v1 "STATE-5 5P ATENr-foffice.

CHARIESN. TEETOR, OF ilAGEsTvN, ENDIANA.

. .miniemen-ren .snofrmme Heron-mire cesrnves Applieation ledctober 25, 1926.v Serial No. 21445022.

l invention relates to -a mechanism; for gslotting piston ring castings which are initially formed elliptical shape in order .that they maykassumecircular shape after 5 being slotted and pnt into use.

Hithertm .in ,slottingfsueh a ring, ring Section was removed leaving ring-end por- Y. tions having I opposedparallel end faces while .the .ring .'isfuncontracted. A ring in i0 .this condition;7 when contracted to bring the' f In calrying .out invention, the `ring depressed inwardly at .theslot formed there-1 25 through in .a flatter side thereof ,to vcause the .opposed faces .ofthe ring ends to4 diverge toward f the interior y ringpgends .are thus positioned, to :bring the 30 opposed facesef .the fri-ng ends substantially intoparallelism. When ,the ',ring is released( from its-holding. means, the opposed end .faces thereof vwill .convergetoward the Sin- Y -terioi' .of .the lring, instead .o-f diverge,-,and

when the .ring -is vlocated within an. operating piston and is held contracted by thefcyli-nder surrounding the piston. 'In accordance ,with fthe preferred `method .of my invention,

bohlikofithe ringfends 'are thus pressed ava-rally .and are trimmed :to slr-ape the: ring at its slot 'fin the manner .and with the results previously set forth. f j

T lie mechanism of my invention includes a holder for the ',ring'ia-nd islet yforming saw,

Y tbe-holder and sawv being relatively .adji'ist,v

:able tofenalalethe saw to ferm sa slot, having substan;tiallyy parallel opposite faces, tlirongli a. yflatter ,sid-e of the-ring, fandmeans for pressii'igg the ring inwardly .at the islott-o cause theop lcsedfacesof the ring ends to diverge towerl the interior of the ring, .the savv i' beingoperative to shape v the ring :at theslet while the iii g .ft-oned-te .brirrggths opposed faces of .of the zringy ,Whereafter` the Iring is shaped .at thezslot,vvliileftlieH .just sufficiently to `.cause these faces .to be- I.comepzira'llel when fully or nearly meeting..

depressed; f Fig. 9 shows, by full-l' lines,'tlie V shape of the ringafter it is released from the illolderwand lin which the opposed end faces lends are thus oei` jring ends substantially tlien into parallelism. l

I n `.the preferred embodiment of the inven` 1011, 'both of the ring Vends are pressed Vinwardly and the sanT isoperative upon these Ypose Stated.

'I will explain invention more fully by reference v to the accompanying drawlngs in which Fig. 121s .a vievv, in elevation, of the preferred mechanism of my invenj ring ends' vvitlitlie results and for' the ipurtion, parts being broken away Vand asup- ,porting bed bengshown in section, yonline lfd of Fig. 2; 2 is a plan -vieW of ythe mechanism shown in .-Fig. 1, the saw and .its sha-ft being shown by dotand 'dash lines;

Fig isasectional view on line f-BofFig.

"25 'F 4c is .a side view of aportion of the vring :illustrating the slot formed therein; 51s .a side view vof the ring portion .slioivn in F ig. 4;, Fig.= 6 is 1a faceview olf a Img casting which 'is -slightly elliptical; 7 diagrannnatically illustrates the ring holder andthe ring, casting after the initial slotting oper-.ation which rvOccurs' with' tlie ring shown in the position indicated by 'full lines, 'the ring and the holder being shown lin any alternative positiongby dot anddaSh lines in which the ends of the. ring at the slot initially vformed therein are pressedji-n- ,Wardly Fg. .81s van .enlarged view' of a part lof the linglat the slottherein as the same .appearsfin Fig. T,tli'is figure also diagramk marticallp7 indicatingtlie use of the saw iin ,trimming ofi? the 'inwardly .depressed v ends Vof fthe-:ring to. bring .the -vendf faceso-f these ring.

ends intoparallelism While theyare inwardly of the ring converge toward ztlie interior -of the ,ring instead of div'erging,' this 'figure 'also showing the shape of the ring when .contracted to bring itsend faces into parallelism andfull engagement.; Fig. 1 0-shows la portion of `theiing at the slot therein tlie :full lines'findicating the full engagement .of Y Athe. ringends :which engagement is findicated t Hap 1 this figure illustrating the shape of the ring, when uncontracted. which shape is also illustrated by full lines in Fig'. 7; and Fig. 12 illustrates, by itull lines, the V-sliaped gap shown by the dot and dash lilies oi Fig'. 1l., the dot and dash lines in Fig'. indicatin lr the relative positions of the unfinished ring ends shown by the full lines in Figs. i', d and 11.

The ring casting 1, shown in Fig. 6,'is slightly elliptical. the horizontal diameter of the ring. as shown in this figure, being` the major dian'ieter thereof. the notch 2 in the ring beine; located in a tlatter side of the ring on the minor diameter thereotand serving;` to indicate the location of the slot that. is to be formed. Tile/ringr casting is placed in a holder, this holder being inclusive of a plate 3 which has holding formations 4.- thereon receivable Withinthe interior of the ring and holding formations thereon upon the i exterior of' the ring. These holding formations are desirably in the form of roll ers which are carried by pins ti that project from the plate The holdingr formations 4 are in snugr engagement with the ring at the ends of the major diameter of the interior of the ring to prevent inaterial reduetion in the major diameter of the ring during the manipulation of the ring. The holding formations 5 are on opposite sides of the H formed in the plate 3 tor the reception oit a .saw which is desirably inclusive of two circular blades 8 fixed upon the same rotating shaft 9, p i

In the .first step of the method, the saw serves to remove a section oi the ring casting;r with the result that a Wide slot is formed between the ends of the ring. the op osing faces of this slot beiner initially para lei, as shown in full lines in Figs. 7, 8 and 1]. and by dot and dash lines in F ig. 12. If the operation were to stop with the initial forination of the slot. a V-shaped gap 10, shown by full lines in Fier 12 and by dot and dash lines in Fig. 1.1, would be formed between the ends of the riner when the ring is cont 'acted while in service. To avoid this objeetionable V-shaped grap, the opposed ends of the ring are trimmed by the saw 8 after the ring;r ends are pressedinwardly to the positions illustrated by dot. and dash lines in Figsiv and S. When the ring ends are thns pressed inwardly. the opposing fares thereof diverge toward the interior of the ring, the saw S beineF again employed to trim the ends of the ring and. bringr their opposing 'faces into parallelism while the ring ends are still .inwardly depressed. When the ring is released, the opposed faces of the trimmed ends of the ringr will con verge toward the interior" of the ring. as shown by full lines in Fig. 9 and dot and dash lines in Fig. l0, to such an extent that these ringr ends will be in parallelism and in "Nats 22 Q3 upon full or nearly full engagement when the ring is contracted While in use, as indicated by dot and dash lines in Fig. 9 and full lines in Fig. 10. The means :for pressing,r the ring ends inwardly, at the slot, preferably .resides in a block 11 having teeth 12 which enlgage the `outward side of the ring opposite the slot therein. By moving,r the block 11 toward the slot to the position diagrammaticailv indicated by dotand dash lines `in Fig. 7. the ends of the ring; at the slot are pressed inwardly to the desired extent.

ln the preferred embodiment of the invention. the shaft 9 which drives the saw 8 desirably has a normally fixed axisoli` rota* tion in which event the plate 3 is provided with rib 13 which enters a groove 14 formed inthe bed 15 of the machine. In the sawing operation, the plate 3 is moved back and forth with its rib 13 in the groove 14 so as to enable the saw to `form the slot in the desired direction which is shown in Figs. di and 5. the slot-beiner angular to the plane opt"` the ring so that. when the ring is contracted the endtaces ot the ringr will be in lappingY relation. posedliietween the wings 16 formed upon the opposite upright sides of the plate 3. The

bloeit 11 is formed with upright slots 17" therethrough, bolts 1S havingr their stems passing through these slots,` the nuts and` heads upon these bolts receiving;F the plate 3 and the block 11 therebetween to holdsaid bloeit between the Wings `16 of the plate. The bottoni face of the block 11 is inclined and engages the inclined face of the Wedge block 19. A shaft 20 isin threaded engage# ment with the Wings 16 ot the plate 3. The

shatt is provided with a head 21 by which it may be turned and as the shaft is turned, it: is moved longitudinalby of its axis by means ot its threaded engagement with said Wings. the shaft 20 'determine the extent to which this shaft longitudinally of its axis. said nuts engaging: the wings 1G respectively adjacent thereto when the limit oi motion has been reached. The Wedfze block 19 accompanies the shaft 20 in its longitudinal movement. lVhen the` slot is beiney initially formed, the shaftis drawn to the right to move the Wedge block tothe right so as to position the hlork 11 to hold the rino: casting?` `for the initial slot tinar operation. 'hen the slot has been iu- `itially formed. the shaft is moved to its ex treme lett hand position in order that the wedge block 19 may raise the block` 1l4 to bead the ends ot the ring, at the slot initially formed in the ring. inwardlyL in pn'eparation ttor the next operation of the saw upon the ring, as hitherto set forth` In the use oi the machine, the plate 3 and the parts movinnr therewith are moved forwardly and baekvardly for the initial slotting operation and are again moved forwardly and may be moved llt) The block 11 is dis itl() lltl liti) i formed slot areV bent inwardly.

vbackwardly for the finishing slot forming operation after the ring ends at the initially The stem 24 of a bolt passes upwardlyvth'rougha slot 25 formed in the bed 15 along the groove 14. The head 26 of` this bolt underlies the bed 15 and the nut 27 overlies the base extensionV 28 of the plate 3.

Having thus described .my invention, I

claim Y 1. Mechanism -for lslotting piston ring `castings which are slightly elliptical includin a holder `for holdingv the ring; a saw, said holder and saw being relatively adjustsaw being again operative to shape the ring tin at the slot while the ring ends are thus positioned to bring theopposed faces of the ring ends substantially into parallelism.

2. Mechanism for slotting piston ring castings which are slightly elliptical including a holder for holding-the ring; a saw, said holder and saw being relatively adjustable toenable the sawto form a slot having. substantially parallel opposite faces throughk a' atter 'side of the rin-g; and means for pressing inwardly both lof the ring rends at l tioned to lbring the opposed faces of the ring the slot to cause the-'opposed faces'of the `ring ends to diverge toward the-interior vof the ring, the saw being again operative to shape both ends of the ring at the slot while the ring ends are'thus positioned to bring `tlie'opposed facesof the ring ends substantially into parallelism.

3. Mechanism for :slotting piston ring castings which are slightly' elliptical including a holder for holdingvthe ringland including portions engaging the ring atthe ends of its major diameter` to prevent material reduction in this diameter of the ring; a saw, said holder and saw being relatively adjustable to enablejtheY sawto form a slothaving substantially parallel opposite Vfaces through a flatter side of vthe. ring; and means for pressing the ring inwardly at the `slot to: cause kthe opposed faces' of the ring-'ends to diverge toward kthe interior of the ring, the

saw being' again operativeA to shape-the ring at the slot while the ring ends yare thuspositioned to bring the opposed faces of the ring ends substantially into parallelism. f l. Mechanism for slotting piston ring Y castings which are slightly elliptical .includi uoY ing a holder for holdingthe ringandincluding portions engaging the ring at the ends of its major ydiameter to prevent material reduction in this diameter ofthe ring.;y a saw, said f f -liatterl side ofthe ring; and means for pressing inwardly both of the ring ends at the slot to cause the opposed faces ofthe ring ends to diverge toward the interior of the ring, the saw being again opera-tive to shape both ends of the ring at the slot while the ring ends are thuspositioned to bring the opposed faces of the ring ends substantially into parallelism. v

5.V Mechanism 'forl slotting piston ring castingswliicli are slightly elliptical including a holder for holding the ring; a saw, said holder and saw `being relatively adjustable to enable the sawto form a slot-having substantially parallel opposite'faces through a flatter side of the ring, said ring holder including two ring engaging formations engaging the interior of the ring at the ends of its major diameter and athird ring engaging formation engaging the eXteriOrjof the f ringadjacent the slot formed therein by the saw; and means for pressing thering against the latter V"ring engaging formation to cause the end part of the ring engaging this for-V mation to be' pressed inwardly at the slot to cause the opposed faces of the ring ends to diverge towardthe interior of the ring, the f saw being again operative to shape the ring at the slot while the ring ends are thus posiends substantially into parallelism.

6.,Meclianism for slotting piston ring castings which are slightlyk elliptical includy vable to enable the saw to form a slot having substantially parallel opposite faces through j a Hatter side ofthe ring, said ring holder in-k j cluding two ring engaging formations engaging the interior ofthe ring atl the ends of its major` diameter and two additional ring engaging formations engagingfthe exterior of the ring adjacent and opposite thesides of the slot formed therein by the saw; and

means for pressing the ring against said ad- Y ditional ring engaging formations to cause the end parts of the ring engaging these additional formations to be pressed inwardly attlie slot to cause the opposed faces ofthe ring ends lto diverge ytowardtlie interior of the ring, the saw being again operative to shape both ends of the ring at the slot while thering ends are thus positioned to bring the opposed. faces of the ring ends substantially into parallelism.

In witnessavhereof, I hereunto subscribe my name. l

CHARLES N. rnnfron. 

